The Only Hot Tub Designed Just for You Bullfrog Spas are premium hot tubs with patented technology, personalized just for you. The only hot tubs to feature the one-of-a-kind JetPak Therapy System™, Bullfrog Spas allow you to select your favorite massage, place it in your favorite seat and interchange massages at any time. Each JetPak® is engineered to provide a specialized massage sensation so you are empowered to create a soothing and completely personalized hot tub experience. Choose from 16 different JetPak massages to design the best hot tub for you and your loved ones.